If you live in an area that is subject to hail, then you will want to know how to detect hail roof damage so that you can claim it with your insurance company.
What does hail damage look like on asphalt shingle roofs?
After a storm loss of mineral granules will be evident particularly on roof slopes facing the direction from which hailstones fell, exposing "fresh" looking shingle substrate.
Hail-damaged roof shingles show more of a scoured effect in which larger, more irregularly shaped areas of shingle surface have lost granules. Worn or weathered asphalt roof shingles if inspected early enough in the course of normal aging and wear cycle may show small areas of granule loss, starting with “bald” areas, or micro-spots, which are typically the diameter of a few mineral granules. Accelerated by sun and weather wear, these “bald” spots will have developed over time as opposed to having developed suddenly during a storm.
Inspect your roof as soon as possible after any storm.
Inspect your roof regularly, ideally annually, so that any damage can be identified and resolved before amassing into a more costly leak. Inspecting your roof regularly enables you to document damage when it occurs so that you can compare the condition of the roof, damage that was or was not present, before and after a specific storm. Inspect your roof promptly after a storm.
Storm damage will most likely affect differing roof slopes in dissimilar ways, as each roofs’ weather exposure varies. Look at the uniformity of roof defects.
The uniformity of roof imperfections over the field of a given slope may help you to understand a probable cause. Blistering of asphalt shingles caused by the product itself might appear uniform over the entire roof on all slopes independent of weather exposure. If only a few bundles of shingles were defective, say from improper manufacture or storage, asphalt shingle blistering may appear in shingles in a specific pattern on a roof subsequent to the application pattern of the shingles themselves as they were nailed to the roof.